Good question! Keith's roadmap will come in the form of a blog/news article, so you will see it on the front page of SWTOR.com. Along with being shared on social media, etc. We will also certainly make a forum post to coincide with it for discussion of the roadmap.

If you want to keep up on updates about the roadmap, keep your eyes on this thread. Keith has been posting updates, especially timing updates in that thread.